JPS57124243A - Detection for surface flaw of steel material - Google Patents

Detection for surface flaw of steel material

Info

Publication number
JPS57124243A
JPS57124243A JP1003781A JP1003781A JPS57124243A JP S57124243 A JPS57124243 A JP S57124243A JP 1003781 A JP1003781 A JP 1003781A JP 1003781 A JP1003781 A JP 1003781A JP S57124243 A JPS57124243 A JP S57124243A
Authority
JP
Japan
Prior art keywords
detection
flaws
cracking
irradiation angle
transverse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1003781A
Other languages
Japanese (ja)
Inventor
Takeo Yamada
Mitsuaki Uesugi
Shigeki Komori
Haruo Miyano
Masato Yoshino
Hajime Yamashita
Yasuteru Tsushima
Isoshirou Ishida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HIYUUTEC KK
JFE Engineering Corp
Original Assignee
HIYUUTEC KK
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HIYUUTEC KK, NKK Corp, Nippon Kokan Ltd filed Critical HIYUUTEC KK
Priority to JP1003781A priority Critical patent/JPS57124243A/en
Publication of JPS57124243A publication Critical patent/JPS57124243A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

PURPOSE:To permit simultaneous detection of longitudinal cracking flaws and transverse cracking flaws simultaneously by setting the directions and angles of irradiation of irradiating light to the surface of a steel material at prescribed values. CONSTITUTION:Illuminators 5, 5 irradiate light which is nearly belt-like parallel light to an area on the surface of a slab S corresponding to the visual field of a solid state image sensing element 14 of an image pickup device 6. The irradiation direction alpha and irradiation angle beta of the irraidating rays are set at the values calculated in accordance with the equations on the basis of an optimum irradiation angle theta1 for detection of longitudinal cracking flaws and an optimum irradiation angle theta2 for detection of transverse cracking flaws. The luminance patterns reflected from the slab S obtained from the device 6 are displayed in a monitor television 22 via an image converter 21, and are inputted to a longitudinal cracking flaw detector 23 and a transverse cracking flaw detector 24.
JP1003781A 1981-01-26 1981-01-26 Detection for surface flaw of steel material Pending JPS57124243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1003781A JPS57124243A (en) 1981-01-26 1981-01-26 Detection for surface flaw of steel material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1003781A JPS57124243A (en) 1981-01-26 1981-01-26 Detection for surface flaw of steel material

Publications (1)

Publication Number Publication Date
JPS57124243A true JPS57124243A (en) 1982-08-03

Family

ID=11739189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1003781A Pending JPS57124243A (en) 1981-01-26 1981-01-26 Detection for surface flaw of steel material

Country Status (1)

Country Link
JP (1) JPS57124243A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63255647A (en) * 1987-03-30 1988-10-21 アルミナム　カンパニ−　オブ　アメリカ Method of inspecting moving metallic surface
JP2004309287A (en) * 2003-04-07 2004-11-04 Nippon Sheet Glass Co Ltd Defect detection device and defect detection method
JP2006329919A (en) * 2005-05-30 2006-12-07 Sumitomo Metal Mining Co Ltd Lighting apparatus and image processing apparatus and method using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63255647A (en) * 1987-03-30 1988-10-21 アルミナム　カンパニ−　オブ　アメリカ Method of inspecting moving metallic surface
JP2004309287A (en) * 2003-04-07 2004-11-04 Nippon Sheet Glass Co Ltd Defect detection device and defect detection method
JP2006329919A (en) * 2005-05-30 2006-12-07 Sumitomo Metal Mining Co Ltd Lighting apparatus and image processing apparatus and method using the same

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